REACTION DES ORGANOLITHIENS AVEC L'ETHOXY-5 DIHYDRO-2,5 FURANNONE-2. PREPARATION DE δ-2 BUTENOLIDES DISUBSTITUES SUR LE CARBONE-4.

Article abstract of DOI:10.1016/0040-4020(82)85016-3

Organolithium react with 5-ethoxy 2,5 dihydro-furan-2-one 1, easily obtained by photoxidation of furfural, leading selectively to 5-hydroxy-2,5-dihydro-furans 4 or to 5-ethoxy-2,5 dihydro-furans 5 disubstituted on carbon 4; the oxydation of the hemi-acetals 4 transforms them with good yields in Δ-2 butenolides disubstituted on carbon 4.